External beam therapy is the most common form of radiotherapy, delivering ionizing radiation such as high-energy x-rays, gamma rays or electron beams directly into the location of the patient's tumour. External Beam Therapy, Second Edition is an essential, practical guide to the use of external beam radiotherapy, highlighting the rapid technological advances made in recent years. It provides a firm background to the physics of external beam radiotherapy, taking the readerthrough the basic principles and discussing issues such as quality assurance.Experts within each field then expand upon tech